Adding and printing machine.



PATENTED AUG. 15, 1905.

V G. WALES. ADDING AND PRINTING MACHINE. AIIPLIOATION rum) SEPT. 15, 1903. RENEWED 11.11.1905.

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(961; ATTORNEY No. 797,032 PATENTED AUG.15, 1905.

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ADDING AND PRINTING MACHINE.

, APPLICATION FILED SEPT. 15, 1903. RENEWED MAB. 11.1905.

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' I w m AIUURNEY PATEN-TED AUG. 15, 1905.

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ADDING AND PRINTING MACHINE. APPLICATION LED snmls, 190s. mmnwnn MAR. 11.1905.

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WITN ESSES (56 730m 5604 ATTORNEY No. 797,032. PATENTED AUG. 15, 1905 O. WALES.

ADDING AND PRINTING MACHINE.

APPLICATION FILED SEPT.15, 1903. RENEWED MAR. 11.1905.

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No. 797,032. I PATENTED AUG. 15, 1905. C. WALES.

ADDING AND PRINTING MACHINE.

APPLICATION FILED SEPT. 15, 1903. RENEWED MAR. 11.1905

15 SHBE/TS-8HBBT 5 MW Wm WM 26M ATTORNEY PATENTHD AUG. 15, 1905. V

C. WALES. ADDING AND PRINTING MACHINE.

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7& ATTORNEY No. 797,032- PATENTED AUG. 15, 1905. G. WALES.

ADDING AND PRINTING MACHINE.

APPLICATION FILED SEPT. 15, 1903. RENEWED MAR. 11. 1905.

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I WITNESSES: U n h V lNI/IINTOR 276w ATTORNEY PATENTED AUG. 15, 1905.

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ADDING AND PRINTING MACHINE.

APPLICATION FILED S BPT.15, 1903. RENEWED MAR. 11. 1905.

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INVENTOR QEQQSQQ i fl 06m 2 (5 BYMMM 96M ATTORNEY PATENTED AUG. 15. 1905.

C. WALES. ADDING AND PRINTING MACHINE.

APPLICATION FILED SEPT.15, 190s. RENEWED MAR.11.1905.

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i ATTORNEY No. 797,032. PATENTED AUG. 15, 1905. G. WALES.

ADDING AND PRINTING MACHINE.

APPLIOATION FILED SBPT.15, 190a. RENEWED MAR. 11.1905.

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' wnmssas: INVENTOR 2 v ameu $2M M BY ham/M? No. 797,032. PATENI'ED AUG. 15, 1905. O. WALES.

ADDING AND PRINTING MACHINE.

APPLICATION FILED SEPT.15, 1903. RENEWED MAB. 11.1 905.

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No. 797,032. PATENTED AUG. 15,- 1905. G. WALES.

ADDING AND PRINTING MACHINE.

APPLICATION FILED SEPT.15, 190a. RENEWED nu. 11.1905.

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WITNESSES: INVENTOR /5 1 W Mada WM 361w ATTORNEY No. 797,032. PATENTED AUG. 15, 1905. G. WALES.

ADDING AND PRINTING MACHINE.

APPLICATION FILED 817F115, 1903. RENEWED MAR. 11:1905.

15 SHEETS-SHEET 14.

WITNESSES: 'INVENTOH g g a yfiztmfl 6%)) I ii ATTORNEY PATENTED AUG. 15, 1905.

C. WALES. ADDING AND PRINTING MACHINE. APPLICATION FILED SEPT. 15, 1903. RENEWED MAR. 11. 1905.

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I UNITED sTATJ Js PATENT OFFICE.

CHARLES WALES, OF DETROIT, MICHIGAN, ASSIGNOR TO THE ADDER MACHINE COMPANY, A CORPORATION OF NEIV JERSEY.

Specification of Letters Patent.

Patented Aug. 15, 1905.

Application filed Septemberlti, 1903. Renewed March 11, 1905. Serial No. 249,554.

To all whom, it may concern:

Be it known that I, CHARLEs lVALEs, a citizen of the United States, and a resident of Detroit, in the county of Wayne and State of Michigan,

" have invented certain new and useful Improvements in Adding and Printing Machines, of which the following is a specification.

This invention relates generally to machines for adding and registering, recording,or printing the results of the additions; but the present application is restricted to the means for adding and registering, the mechanism for recording or printing the results forming the subject-matter of another application filed simultaneously herewith, to which reference is made.

The machine subject of this application is operated by depressing keys arranged in series in a keyboard to set corresponding stops in the path of racks which by the operation of a main operating lever or handle are brought into mesh with pinions mounted on corresponding registering-wheels, one for each set of keys and bearing corresponding numerals, whereby the wheels are actuated to display numerals similar to those keys which have been depressed.

In order that the invention may be readily comprehended, I have illustrated an embodiment thereof in the accompanying drawings, in which Figure 1 represents a plan view of the machine, part of the key-apron being broken awayand part of the printing or recording mechanism being omitted. Fig. 2 represents a side elevation of substantially the same parts illustrated in Fig. 1 looking at the right-hand side of the machine, the casing of the machine being removed. Fig. 3 represents a similar view looking at the left-hand side otthe machine. Fig. 4 represents a vertical transverse sectional view of the machine, taken on the broken line 4 4 of Fig. 6. Fig. 5 represents a horizontal longitudinal sectional view taken on the broken line 5 5 of Fig, 6, the keyboardsection of the machine being omitted. Fig.

6 represents in side elevation one of the trains of mechanism in its normal position or state of rest, parts being shown in section, parts in dotted lines, and parts broken away. Fig. 7 r represents in side elevation substantially the parts shown in Fig. 6 in the positions they assume when the forward stroke of the operating lever or handle is nearly but not quite completed with the No. 9 key of the train or series depressed. Fig. 8 represents in side elevation substantially the parts shown in Figs. 6 and 7 in the positions they assume at the end of the forward stroke of the operating-handle. Fig. 9 represents in side elevation substantially the parts shown in Figs. 6, 7, and 8 in the positions they assume when the return stroke of the operating-handle is nearly but not quite completed, the registering numeral-wheel, as in Figs. 7 and 8. being set to display the numeral 9. Fig. 10 represents in side elevation substantially the same parts as in the four preceding figures in the positions they assume when a second for ward stroke of the operating-handle is nearly but not quite completed, such stroke from the No.9 position, before illustrated, bringing the carrying mechanism into operation. Fig. 11 represents in side elevation substantially the same parts in positions they assume during a return stroke, which operates the carrying mechanism at what I denominate the first release of the jack. Fig. 12 represents in side elevation substantially the same parts in the positions they assume when the operating-lever has nearly but not quite reached the end of the second return stroke, the jack being sprung and the carrying opera tion being completed. Fig.1?) represents, on an enlarged scale, in side elevation, the carrying mechanism in its normal position or state of rest. Fig. 1% represents in side elevation, on the same scale as Fig. 13, the same parts in the positions they assume when the forward stroke of the handle is nearly but not quite completed, showing the parts locked to hold the jack. Fig. 14 is a detail plan view of some of the parts shown in Fig. 14. Fig. 15 represents in similar view and on the same scale as Fig. let the same parts in positions assumed during return stroke at the first release of the jack. Fig. 16 represents in similar view and on same scale the same parts in positions assumed during return stroke when the jack is released and the carrying operation completed. Fig. 17 represents the mechanism comprising the jack in plan view. Fig. 18 represents in rear elevation the keyboard-section of the machine detached, illustrating the key-release slide-bar and its vertical operating-sl'iaft supported in the main frame of the machine. resents in perspective view what 1 denominate the shutter mechanism for holding up and releasing the rack-stops on the inner ends of the key-levers. Fig. 20 represents the same mechanism in rear elevation, partly broken away, showing two keys depressed and the corresponding stops raised and two other keys raised and their stops lowered. Fig. 21 represents the same mechanism, showing the keys released and their stops in lowered positions. Fig. 22 represents in perspective view the Zero-resetting mechanism, the full lines showing the parts in the normal position of rest and the dotted lines in the positions to which they are moved by the operation of the vertical lever throwing the rack into mesh with the numeral-wheel pinion. Fig. 23 represents in side elevation parts of the mechanism of Fig. 22 in their normal position of rest. Fig. 24: represents similarly the same parts after the vertical lever has been pulled or operated. Fig. 25 represents the zero-resetting mechanism in side elevation in the positions assumed when the resetting operation has been completed, other adjacent parts being shown in dotted lines. Fig. 26 represents in enlarged detail view the elevating-arms attached to the registering-wheel shafts. Fig. 27 represents in perspective view one of the registeringwheels looking at the pawl side thereof. Fig. 28 represents a similar view looking at the opposition side or pinion thereof. 'Fig. 29 represents in enlarged perspective detail view the sliding bearing-block for the registering-wheel shafts. Fig. 30 represents in enlarged detail view the connection of its actuating-arm with the vertical shaft of the keyresetting mechanism. Fig. 31 represents in enlarged perspective detail view the guide for the actuating arm of Fig. 30. Fig. 32 represents in enlarged view the keystem guide mechanism.

Like reference characters will be used to designate the same parts where they appear in one or more of the figures of the drawings. Before entering upon a particular description of the parts of the machine illustrated in the drawings I will outline its general characteristics in order that the relation of the parts to each other and to the whole may be clearly understood as the specification proceeds.

The machine has a keyboard and key-levers, which will remain in either one of their two positions until moved therefrom by an im pulse received from the operator through the keys or other parts of the machine. These levers operate a series of stops and interpose them into the path of the racks, which determine the relation of the numeral-wheels, the position of the particular stop thus interposed determining the extent of the wheels rotation, and consequently the particular numeral on the periphery of the wheel in view when Fig. 19 repl the rotation is checked. 'The racks are normally out of mesh with pinions on the registering-wheels and are brought into mesh prior to the rack being moved in the direction to rotate the wheels. The numeral on the key corresponds to the number displayed on the wheel when the wheel comes to a standstill. Stop and release mechanism is employed which holds the racks until the number desired to be added is written on the keyboard by the depression of the keys. The racks are brought into mesh with the wheels by the action of the main operating lever or handle, which upon its return stroke returns the racks to their normal positions, simultaneously rotating the wheels in mesh (through their pinions) with the racks which have been displaced. The wheels are returned to their zero or normal positions by mechanism operating upon pawls secured to wheels, the latter being mounted on the shafts. Suitable mechanism is also provided for returning the keys to their normal raised positions at the end of an operation or at any time for correcting a mistake by depressing the wrong key. Most of the parts are held in normal positions or actuated in one direction by springs.

Referring particularly to the drawings by reference characters, the base-frame, which is preferably rectangulaf, is indicated by the numeral 1, which is properly shaped to support the main frame, which carries all of the actuating mechanism. The main frame comprises on each side of the machine an up right, as at 2 in Fig. 2 and 3 in Fig. 3, from which project forward and rearward arms, as at 4, 5, and 6 in Fig. 2 and 7, 8, and 9 in Fig. 3, the forward arms 1 and 7 being connected with the uprights 2 and 3 by brackets or braces 10 and 11, respectively.

12 indicates the keyboard, which supports the forward portion of the machine, which I have denominated the keyboard-section, a frame-piece, as at 13 and 14:, being secured to the under side of the keyboard at each side, said framepieces terminating at their forward ends in depending uprights 15 and 16, which rest upon the base-piece 1 and being connected at their rear ends to the arms 4 and 7 of the main frameby means of across-rod 17.

The whole mechanism will be inclosed in a suitable casing, which 1 have not illustrated and which may be of any suitable material and ornamented in any desired manner.

Through the keyboard are suitable perforations to admit of the passage therethrough of key-rods 18, upon the tops of which are secured keys 19, held normally in their raised positions by springs 20, coiled around the key-rods between the keys and the keyboard. The keys and the trains of mechanism connected therewith are arranged in series, as clearly shown in Fig. 1, each series comprising keys bearing numerals from 1 to 9, in-

clusive, the series extending longitudinally of into its proper operative position the machine side by side, that series on the right being intended to be operated to add units, the next series to the left tens, and so on, the capacity of the machine illustrated in Fig. 1 being to add sums up to nine million nine hundredand ninety-nine thousand nine hundred and ninety-nine dollars and ninetynine cents, the capacity of each machine, gov- .erned by the number of series of keys and connected mechan isms, bei ng regulated as may be desired to suit the use to which the machine is to be put. In the several views illustrating the machine only one series is generally used, inasmuch as they are all constructed and operate alike, and the general mechanism, such as the main operating-handle, the resetting devices, &c., are connected to all the series in the same manner. In each series the key-rods 18 are pivotally connected at their lower ends to key-levers 21. pivoted intermediate their ends, as at 22 in Figs. 3, 6, and others, to frame-pieces 23 24, rigidly secured to the frame-pieces 13 and 14, respectively, by cross rods or bolts 25, the pivotal points being located with relation to the length of the key-levers to give each lever the proper length forward and aft of the pivot as at 26, upward when to move a stop-bar, the key is depressed to bring said stop-bar said stopbars being pivotally connected to the rear ends of the key-levers and passing upward in series through slots in angle-plates 27 28, secured to the frame-pieces 13 and 14 by bolts 29, (see Fig. 19,) the slots being made adjustable in length to properly accommodate the series of stops by passing the bolts 29 through slots'30 in either of the plates 27 or 28. Each series of stops is also fu rth'er guided and kept in alinement by cross-pins 31, connecting the plates 27 and 28, Fig. 19.

The parts hereinbefore described constitute all of the removable keyboard-section of the machine except parts of the stop supporting and releasing or ke resetting mechanism,

. which I shall next proceed to describe.

hen a key is depressed, the corresponding stop-bar is raised, as shown in Figs. 7, 8, and 10, and as each series of stops is in the path of movement of a rack, as at 32 in said figures, the movement of the rack forward is limited by said stop. After the rack is moved (by means of its spring against the stop) the rack is moved rearward to actuate the corresponding registering-wheel by the operation of a main lever or handle 33 through the medium of connections to be hereinafter described, the wheel being actuated during the rearward or return stroke of the handle. This handle 33 is rigidly secured to the main rockshaft 34, which is journaled in lugs 35, erected on the base 1, which shaft also carries a crankarm 36, (see Figs. 5, 7, 8, and 9,) to which are connected several arms or links, to be later described, by means of a bolt or pin 37 which l r l l l l l l l l l l l l projects inwardly beyond the crank-arm and in the rearward rocking of the main shaft engages a shoulder 38 of a link 39 and presses the said link rearwardly. At its rear end this link is pivotally connected with a longi tudinal crank-arm 40 (see Fig. 30) on a vertical shaft 41, journaled in the base and frame of the machine and provided nearer to its upper end with another crank-arm 42, connected by a link 55 to a bar 43, rigidly secured to a horizontal transverse bar 44, mounted slidably upon the angle-plate 27 of the keyboardsection by means of bolts or screws 45 passing through slots 46 in said bar 44 (see Figs. 19, 20, and 21) and into said angle-plate. Adjacent to each series of stops a shutter or broad pawl 47 is journaled in the angle-plates 27 and 28 in such a position as to rest normally against the sides of all of the stops of each respective series. Upon each stop on the side with which the shutter engages is a lobe or projection 48, the lobes of each series being in line with each other when all of the stops of the series are either raised or lowered. \Vhen a stop is raised by the depression of a key, as hereinbefore described, the lobe passes above the engaging edge of the shutter and rests upon the edge thereof, whereby as long as the shutter remains in its normal position the step will be held up or locked in its raised position by the engagement of the shutter with its lobe. During the raising of a stop the passage of its lobe under the shutter will force the edge of the shutter far enough away from the other stops to permit the lobes of any stops which might be already raised to pass down under the force of the key-raising springs, and thus leave only the last-actuated stop in the raised position. This function makes a correcting device of this mechanism as well as a stop-releasing and key-resetting device. When the operating-handle is moved rearwardly, the main shaft is rocked, and through the connections described the vertical shaft is also rocked, thus sliding the transverse horizontal bar 44 to the right, as seen in Figs. 20 and 21, when by virtue of the engagement of the projecting end 49 of each shutter in a corresponding notch 50 in the upper edge of bar 44 all of the shutters will be pushed away from their respective series of stops, thus permitting all of the raised stops in all of the series to be lowered into their normal positions by the raising of the corresponding keys by means of their raising-springs. Near its forward end the link 39 is formed with a cam-surface 51 which at the end of the operating niovementof said link rides over roller on a pin 52, which is mounted in a short standard 53, erected on the base 1, (see Fig. 31,) thereby raising the link, disengaging the shoulder 38 from the pin 37 of crank-arm 36, and permitting the springs 54 to draw the shutters to the left against the stops and the bar 44 to the right (from the position of Fig. 21 to that of Fig. and rock the vertical shaft, thus throwing the link 39 forward to its normal position. its next forward movement, rocking the main shaft and carrying the crank-arm 36 forward with it, the pin 37 rides under the link and again takes position in front of the shoulder 38, ready for the next movement rearward, as before described.

As hereinbefore noted, each train of mechanism, beginning with the series of keys, is provided with a rack 32, which actuates a numeral or registering wheel by means of the mechanism now to be described, the operation of which will be best understood by reference to Figs. 2, 7, 8, 9, 10, 25, &c. In Fig. 7 the parts are shown in the positions they assume when the forward stroke of the operating-lever has been nearly but not quite completed.

Journaled in the arms 1 and 7 of the main frame is a transverse rock-shaft 56, to which is secured an arm or lever 57, Fig. 2, provided in its free end with an open-ended camslot 58, in which works a roller 59 on a pin projecting laterally from the free end of an arm 60, secured to the main rock-shaft 3 1. On the rock-shaft 56 are secured a number of curved arms 61, corresponding to the number of trains of mechanism, and in the free ends of these arms is secured a cross-rod 62, extending from the first to the last of these arms, (see Fig. 1,) which rod carries a roller 63 for each train or series. Each rack is mounted on the upper ends of arms 64 and 65, pivoted on cross-rods 66 and 67, mounted in the side frames, and is normally drawn forward by a spring 68, secured at its respective ends to arm 64 and to the frame. As the main lever is moved forward the roller 59 throws the lower end of arm 57 forward, rocking the shaft 56 and throwing the cross-rod 62, with the rollers 63, forward and permitting springs 68 to carry forward against the stops all racks corresponding with the depressed keys. The rest of the racks are retained in their normal positions by means of a series of retainingstops 69, pivoted on a cross-rod 7 O, secured in the frame, which stops rests normally on top of the stop-rods of each series and are raised out of the way of the racks by the raised stop-rods. When the forward stroke of the operating-lever is nearly completed, as illustrated in Fig. 7, the rack is in contact with the raised stop, in this instance the stop corresponding with key No. 9, which is shown depressed, and the completion of the stroke to the position of Fig. 8 has no further effect upon the longitudinal movement of the rack, which up to this time has been unconnected in any way with the registering-wheel,which is normally set to expose 0. In order to connect the rack with the registering-wheel, it is necessary to either lower the wheel or raise the rack, and in this machine I have As the main operating-lever makes provided means for lowering the wheel,which I will now describe.

There is a registering-wheel 71 for each rack, each wheel constructed as shown in detail in Figs. 27 and 28, said wheels being o9 loosely mounted on a shaft72, journaled in the side frames (see Figs. 1 and 1) and having two series of numerals 1, "2, 3, 4-, .5, 6, 9, and 0 on its periphery, a series of cogs or teeth 73 at the left side of the periphery, a double pawl 74, and a pinion 75 on its right-hand side, all of these parts being rigidly secured or formed together. The teeth 73 are engaged by rollers 76, journaled on pins in the forward arms of elbow-levers 77, mounted on a cross-rod 78, secured in the frame, the rear arms of said elbow-leversbeing normally held against a cross-rod 79 by springs 79" secured in the frame, in which normal positions the rollers are yieldingly held in engagement with the teeth of the wheel when the wheel is in its raised position to prevent displacement of the wheels by accidental turning. The shaft 72 is mounted at each end in abearing-block 80, (see Figs. 2, 3, 22, 26, and 29,) and on the endsof the shaft beyond the bearing-block are suspended four bars, which I denominate latch-bars, two of such bars (numbered 81 and 82) being on the right-hand end (see Fig. 2) and two (numbered 83 and 8 1) on the left-hand end. (See Figs. 3 and 7 to 9.) The bars 81 and 83 are of like construction and are provided with notches 85 and 86 to engage catches 87 and 88, projecting from the frame, while the bars 82 and 8 1 are alike in construction, beingprovided with shoulders 89 and 90 for purposes later described. Pivotally connected with the latch-bars 81 and 83 are bars 91 and 92, provided with slots 93 and 9 1 which engage over a cross-rod 95, secured in the lower ends of arms 96, secured to the cross-rod 67, said bars 91 and 92 being normally drawn rearward by springs 97 98, connecting them with a crossrod 99, mounted on lugs 100 on the base 1 of the frame. Connected to the cross-rod 95 (on the left-hand side of the machine, as seen in Figs. 3 and 7 to 9) is a link or bar 101, which is connected at its forward end to the bolt or pin 37 of the crank-arm 36 on the main rocking shaft 3&. Connected to the cross-rod 95 on the right-hand side of the machine (as seen in Figs. 2 and 5) is another link 102, the forward end of which is connected to a crankarm 103, rigidly secured to the main rockshaft 34. From this crank-arm projects astoparm 104k, which by striking the base of the machine limits the forward stroke of the main operating-lever. On the crank-arm 60 is a pivoted pawl 105, normally but yieldingly held with its point toward the main shaft by a spring 106. If at any time during a stroke of the operatingdever it slips from the operators hand or it is desired to stop it, this pawl 105 will engage one of a number of notches 107 in the periphery of a fixed sector-shaped plate 108 and hold the lever stationary. At either end of the stroke of the operating-lever the pawl passes beyond the sector ready to act in either direction. While that part of the forward stroke of the operating-lever which ends in the position shown in Fig. 7 is made the latchbars 81 and 83 remain in their normal positions engaging their catches and holding the shaft of the registering-wheels in its upper position with the wheels out of mesh with the racks, the cross-rod moving to the forward end ofslot 94. The continuation of the stroke brings the parts to the position of Fig. 8, drawing the bars 91 92 forward, releasing the latch-bars 81 and 83 from their catches 87 and 88, and permitting the registering-wheels and shaft to drop and bring the pinions 75 to engage With-the racks held in position against their raised stops, the dropping of the registering-wheel shafts being assured by the action of springs 109, connecting latch-bars 82 and 84 with the base of the frame. \Vith the parts thus positioned, as in Fig. 8, the return or rearward stroke of the operating-lever is made, which is assisted by springs and 111, connecting arms 112 and 113 on the links 101 and 102 with the base of the frame. During this stroke the racks are forced rearward by the reversal of the movements before described, causing the registering-wheels to be rotated a number of steps corresponding to the keys depressed (being in the instance illustrated nine steps) and to expose at the proper place-of observation the numeral added, (being 9 in this instance,) as indicated in Fig. 9. This movement is accomplished before the return stroke is quite completed, and during this part of the stroke the cross-rod 95 has traveled to the rear end of slot 94;. In the latter part of this stroke the cross-rod pressing against the rear Wall of the slot pushes the bar 92 rearward and by pressing against shoulders 89 and 90 of latch-bars 83 and 84 pushes these latch-bars upward, restoring the registering-wheels to their normal positions out of engagement With the racks. The latches 81 and 82 are also raised at the same time, causing theirnotches 85 and 86 to engage the catches 87 and 88 and retain the registeringwheels in their normal raised positions until the operation is repeated. At any time during the operation of the machine the registering-wheels may be reset or returned to their normal positions to expose zero at the point of observation by means of the mechanism which I shall now describe and which is specially illustrated in Figs. 22 to 26.

Pivoted on cross-rod 67 is a handle-lever 114E, projecting above the top of the machine to an intermediate part of which, at 115, is pivotally connected a link 116, extending rearwardly and pivotally connected at its rear end to a crank-arm 117, secured on a rockshaft 118, which also carries a crank-arm near each end, as at 119, from which latter crankarms extend links 120, connecting them with plates 121, pivoted to the side pieces of the frame and adapted to engage pins 122, projecting from latch-bars 81 and 83. By pulling the handle-lever 11 1 forward the plates 121 are forced forward against pins 122, thus also forcing latch-bars 81 and 83 forward, disengaging their notches 85 and 86 from the catches 87 and 88 and permitting the registering-wheel shaft to drop, thus bringing the pinions 75 into mesh with the racks 32, so that the wheels may be turned in reverse direction by moving the main lever, bringing the wheels to posi- 'tion to expose Zero,'the wheels being stopped in their normal or zero position by the double pawl 74., contacting with a pin on a trigger 128, (see Fig. 25,) further functions of which trigger will be disclosed in the description of the carrying mechanism hereinafter. It be ing necessary in order to accomplish this reverse rotation of the wheels in resetting them to Zero that the racks 32 be moved in a forward direction and this movement being ordinarily prevented by the retaining-stops 69 until they are raised by the key-stops, mechanism must be provided for raising these retaining-stops by the movement of the handlelever llt. For this purpose I provide a laterally-projecting pin 123 on the handle-lever wheel, which in the forward movement of said lever rides under a latch-lever 124, secured to a cross-plate 125, extending under all of the retaining-stops, (see Figs. 22 to 24,) whereby the latch-lever moves, thus raising all of the retaining-stops out of the paths of the racks. A notch 126 in the latch-lever engages over the pin 123 at the end of the movement, holding the latch-lever, cross-plates, and retaining-stops in their raised positions as long as desired.

The sum of nine being registered by the operations before described, the next operation will require that at least the sum of one be carried from the wheel showing 9 to the next Wheel to the left-in this instance from the units-wheel to the tens-wheel-and I will now proceed to describe the mechanism which I have provided for accomplishing this carrying operation, which is specially illustrated in Figs. 13 to 16 and parts of it incidentally in other figures.

The trigger 128 is pivotally mounted substantially in the plane of the units-wheel upon a cross-rod 129 and is provided with a laterally-projecting pin 130 near its upper end on the plane of rotation of the double pawl 74 of the units-wheel, a spring 131 serving to normally but yieldingly draw the trigger toward the double pawl. A second pin projects laterall y from the trigger at about its mid-length, which carries a roller 132 in the plane of a levcr 133, pivoted on a cross-rod 13 1, there being another pin 135 projecting from the trigger above the roller, also in the plane of lever 

